- Pelikan 4001 cobalt blue ink cartridges, designed for the griffix pen and compatible with most Pelikan fountain pens and other brands - Value pack with 10 cartridges (2 blisters of 5 units each), ideal for frequent use at school, office, or home - High-quality erasable ink, perfect for clean writing and simple corrections - Made in Germany with resistant and durable materials, guaranteeing a constant ink flow - Easy-to-install refill, suitable for beginners and advanced users - Blister presentation for better preservation and transport